import 'package:flutter/material.dart';
class Plan extends StatefulWidget {
  @override
  _PlanState createState() => _PlanState();
}

class _PlanState extends State<Plan> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(

        body: ListView(
            children: <Widget>[
              const ListTile(title: Text('Top')),
              ExpansionTile(
                  title: const Text('Sublist'),
                  backgroundColor: Theme.of(context).accentColor.withOpacity(0.025),
                  children: const <Widget>[
                    ListTile(title: Text('One')),
                    ListTile(title: Text('Two')),
                    // https://en.wikipedia.org/wiki/Free_Four
                    ListTile(title: Text('Free')),
                    ListTile(title: Text('Four'))
                  ],
                trailing: Text("hh"),
              ),
              
              
              const ListTile(title: Text('Bottom'))
            ]
        )
    );
  }
}
